F&SF's 15-day submissions waiting period: Can anyone clarify?

Hi, folks. My apologies if this isn't the right place for this question -- the truth is that I don't come around here very often these days, and I certainly don't want to step on any forum toes. ;^.^

In any case, here is my question: As I'm sure all you SFF short-fiction writers know, F&SF (aka the venerable _Magazine Of Fantasy And Science Fiction_) has a brand-new editor, C.C. Finlay, and a brand-new policy of accepting submissions online, as well as a brand-new submissions site for this purpose. (To which I say, HALLELUJAH, and IT'S ABOUT TIME.)

My question: On the submissions site, it says: "There is currently a 15-day waiting period between submissions."

Does anyone have a clearer understanding than I do of whether this should be taken to mean "please wait 15 days after _submitting your last story_," or "please wait 15 days after _hearing back about your last story_" ?

That is, for example:
If I submit a story;
and after, let's say, 20 days, I receive a polite rejection;
then,
should I assume that I should wait 15 days before submitting again?
Or, for that particular case, not? Should I feel free to submit again right away?

(I guess that if no one else can parse the matter better than I, I'll just email the inquiries address and ask. I feel... terribly shy _doing_ that, though. Hm.)

Thanks!

(That sub site, for reference: http://submissions.ccfinlay.com/fsf/ )

Hm. Thanks for the responses and thoughts, everyone!

These look like some interestingly contradictory replies. Given that, I think I'll email directly and ask. Thanks again!

OH HEY TURNS OUT THERE'S NO NEED. The page has been updated and clarified!

"Please no simultaneous or multiple submissions. There is currently a 15-day waiting period between submissions. (That means if it takes me 15+ days to reject your story, you can submit again immediately.)"

http://submissions.ccfinlay.com/fsf/

Well, I guess that goes to show it pays to ask. Most of us were assuming it _must_ mean "after rejection." But, in fact, that was not the case.